Device for adjusting the angle of inclination of guide blades of turbo machines

ABSTRACT

A device in which there is a series connection of driven elements permanently connected with the guide blades of a turbomachine in a kinematic train by means of intermediate idle elements, drive mechanism adapted to effect an independent turning of two adjacent driven elements in opposite directions, with the resulting expanding force making for the elimination of free play in the kinematic train.

United States Patent Kaplansky et al. 14 1 Aug. 8, 1972 [54] DEVICE FOR ADJUSTING THE ANGLE [56] References Cited OFIN LINA 0F TICIRBO BLADES UNITED STATES PATENTS [72] Inventors: Arkady Fridmovich Kaplanskya 2,427,136 9/1947 Hagen et a] ..4l5/ 147' w i i ,f x FOREIGN PATENTS OR APPLICATIONS ,;;j L gef g jgg 380,701 9/1932 Great Britain ..415/l63 I 4 Primary Examiner-Henry F. Raduazo [73] Assignee: Nevsky Mashinastroitelny Zavod Attorney-Holman & Stern imeni V. J. Lenina, Leningard, USSR. [57] ABSTRACT [22] Filed: N0v.4, 1970 A device in which there is a series connection of driven elements permanently connected with the [211 App! 86302 guide blades of a turbomachine in a kinematic train by means of intermediate idle elements, drive mechanism 52 US. 01 ..415/147, 415/160 adapted to effect an independent turning of two 511 1m. (:1. ..F04d 15/00, F04d 27/00 jaeent driven elements in pp directions, with the [58] Field of Search ..4l5/l46, 147, I48, 149, 160, resulting expanding feree making for the elimination of free play in the kinematic train.

2 Claims, 1 Drawing Figure BACKGROUND OF THE INVENTION The present invention relates to devices for controlling the operating conditions of turbomachines and, more particularly, to devices for adjusting the angle of the guide blades of turbomachines.

Known in the art are devices for adjusting the angle of inclination of compressor guide blades relative the flow of a working fluid, with each of the blades being permanently connected to its driven element for their joint turning resulting from the drive mechanism effect upon the driven elements of the guide blades.

In the known devices, the driven elements permanently connected to the guide blades are essentially driven gears which are in constant mesh with a sun wheel to which is imparted motion from the drive mechanism. In order to adjust the angle of inclination of the guide blades, motion is imparted to the sun wheel from the drive mechanism.

When this is done, the driven gears which are in constant mesh with the sun wheel make, together with the guide blades, a turn through a present angle relative the flow of the working fluid.

It should be noted that the kinematic train connecting the guide blades to the drive mechanisms, like any other kinematic train comprising links in gear mesh, embodies free play which affects unfavorably the service life of the known devices.

In the course of the compressor operation, the guide blades of the known devices, which are in a moving flow of working fluid, vibrate, which means that the elements permanently connected to the blades vibrate as well. When vibration occurs, the above-mentioned presence of free play causes alternating impact loads which affect elements and units of the device and can result in their destruction.

It is an object of the present invention to eliminate the above mentioned disadvantage of the known devices.

The main object of the present invention is to prorespective one of the drive links of the drive mechanism.

Therefore, in the proposed device, one drive link of the drive mechanism is adapted to impart to the links of the kinematic train connecting the drive mechanism with the guide blades, a motion which provides for the turning of the guide blades through a preset angle relative the flow of the working fluid, while the other drive link is adapted to impart another motion independent of the motion and creating a force making for the elimination of free play in the kinematic train.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention will be better understood upon considering the following detailed description of an examplary embodiment thereof taken in conjunction with the accompanying drawing which illustrates a diagrammatic view partly broken away of a device for adjusting the angle of inclination of guide blades, according to the invention.

DETAILED DESCRIPTION OF THE INVENTION Referring now to the drawing, in the present device for adjusting the angle of inclination of guide blades 1 of a turbomachine relative the flow of working fluid. each of the blades is permanently connected with its driven element, i.e. a driven gear 2, for their joint turning resulting from the effect of a drive mechanism upon the driven elements. The driven elements, are series connected in a kinematic train by means of intermediate idler elements, i.e. intermediate gears 3, while a drive mechanism A is adapted to effect an independent turning of the adjacent driven elements in opposite directions. The resulting expanding force results in the elimination of free play in the kinematic train.

According to the invention, the drive mechanism A has two drive links 4 and 5 rotating in opposite directions as indicated by the arrows. The kinematic train connecting the guide blades 1 with the drive mechanism A comprises the series arranged driven gears 2 and the intermediate gears 3 which are in constant mesh and is open in its portion B between two advide a device for adjusting the angle of inclination of jacent driven gears guide blades of turbomachines, in which provision is made for the elimination of free play in the kinematic train connecting the guide blades with the drive mechanism.

SUMMARY OF THE INVENTION The problem of the invention is solved in the proposed device in which, according to the present invention, driven elements are series connected in a kinematic train by means of intermediate idler elements, while the drive mechanism is adapted to effect an independent turning of adjacent driven elements in opposite directions, with the resulting expanding force making for the elimination of free play in the kinematic train.

The most successful solution of the problem can be attained in case the drive mechanism has two drive links of opposite rotation while the kinematic train, which comprises series arranged driven and intermediate gears which are in constant mesh, is open in its portion between two adjacent driven gears, with each of the latter driven gears being connected with the Each of the two adjacent driven gears 2 is connected with the respective one of the drive links 4, 5 of the drive mechanism A. The first drive link 4 imparts lefthand rotation to the links of the kinematic train, and the second drive link 5 a right-hand rotation.

The device according to the present invention operates in the following manner:

The drive link 4 of the drive mechanism A imparts left-hand rotation to the gears 2 and 3. At the same time, the blades 1 permanently connected to the gears 2 turn through a preset angle relative the flow of the turbomachine working fluid. Thereupon, the drive link 4 is stopped. Then, by means of the drive link 5, the links of the kinematic train are caused to turn in a direction opposite to that of their previous turning, thus resulting in the emergence of an expanding force providing for the elimination of free play in the gear mesh. Thereafter, the drive link 5 is likewise stopped.

I Should it be necessary to turn the guide blades 1 in the opposite (right-hand) direction, the links of the kinematic train connecting the blades to the drive mechanism A are turned with the aid of the drive link 5 of the drive mechanism, while another turn (in the opposite direction) of the links of the kinematic train for the elimination of free play in the latter is effected with the aid of the drive link 4.

Owing to the fact that in the course of the operation of the device free play is eliminated in the kinematic train connecting the guide blades with their drive mechanism, alternating impact loads and vibration affecting the elements of the device are overcome.

All of this has a favorable effect upon the duration of the service life of the device, especially when using the same in turbomachines with a considerably dense working fluid.

What is claimed is:

1. A device for adjusting the angle of inclination of guide blades of turbomachines relative the flow of a working fluid, comprising: driven elements each of said driven elements being permanently connected with one of said guide blades with a possibility for their joint turning; intermediate idler elements providing a series connection of said driven elements in a kinematic train; and a drive mechanism operably connected to one pair adjacent driven elements of said kinematic train whereby activation of one drive mechanism effects rotation of the driven elements and idler elements and hence the blades in one direction through a preset angle relative to the flow of working fluid and upon deactivation of said one mechanism and activation of the other mechanism there is effected a rotation of said driven and idler elements in the other direction with the resulting expanding force making for the elimination of free play between the driven and intennediate elements in said kinematic train.

2. A device for adjusting the angle of inclination of guide blades of turbomachines relative to the'flow of a working fluid, comprising driven elements, each of said driven elements being permanently connected with one of said guide blades with a possibility for their joint turning; intermediate idler elements providing a series connection of said driven elements in a kinematic train; and a drive mechanism operably connected to each of adjacent driven elements of said kinematic train whereby activation of one drive mechanism effects rotation of the driven elements and idler elements and hence the blades in one direction through a preset angle relative to the flow of working fluid and upon deactivation of said one mechanism and activation of the other mechanism there is eflected a rotation of said driven and idler elements in the other direction with the resulting expanding force making for the elimination of free play between the driven and idler elements in said kinematic chain, the drive mechanism including two drive links rotatable in opposite directions while the kinematic train, which comprises series arranged driven and intermediate gears which are in constant mesh, is open in its portion between two adjacent ones of said driven gears, with each of the adjacent driven gears being connected with a respective one of said drive links of the drive mechanism. 

1. A device for adjusting the angle of inclination of guide blades of turbomachines relative the flow of a working fluid, comprising: driven elements each of said driven elements being permanently connected with one of said guide blades with a possibility for their joint turning; intermediate idler elements providing a series connection of said driven elements in a kinematic train; and a drive mechanism operably connected to one pair adjacent driven elements of said kinematic train whereby activation of one drive mechanism effects rotation of the driven elements and idler elements and hence the blades in one direction through a preset angle relative to the flow of working fluid and upon deactivation of said one mechanism and activation of the other mechanism there is effected a rotation of said driven and idler elements in the other direction with the resulting expanding force making for the elimination of free play between the driven and intermediate elements in said kinematic train.
 2. A device for adjusting the angle of inclination of guide blades of turbomachines relative to the flow of a working fluid, comprising driven elements, each of said driven elements being permanently connected with one of said guide blades with a possibility for their joint turning; intermediate idler elements providing a series connection of said driven elements in a kinematic train; and a drive mechanism operably connected to each of adjacent driven elements of said kinematic train whereby activation of one drive mechanism effects rotation of the driven elements and idler elements and hence the blades in one direction through a preset angle relative to the flow of working fluid and upon deactivation of said one mechanism and activation of the other mechanism there is effected a rotation of said driven and idler elements in the other direction with the resulting expanding force making for the elimination of free play between the driven and idler elements in said kinematic chain, the drive mechanism including two drive links rotatable in opposite directions while the kinematic train, which comprises series arranged driven and intermediate gears which are in constant mesh, is open in its portion between two adjacent ones of said driven gears, with each of the adjacent driven gears being connected with a respective one of said drive links of the drive mechanism. 